LU-5610 tests: Handle quoted module options

LU-5610 tests: Handle quoted module options

When test-framework.sh translates module options to environment
variables for remote nodes, quotes should be escaped to the subshell.

This patch is back-ported from the following one:
Lustre-commit: 4597789df0b6b9fcc7bcbe5529adab3522f0e6ac
Lustre-change: http://review.whamcloud.com/11887

Signed-off-by: Stephen Champion <schamp@sgi.com>
Change-Id: I02daf5ca36170ea901f6b0e4e5152cf4835945dc
Signed-off-by: Jian Yu <jian.yu@intel.com>
Reviewed-on: http://review.whamcloud.com/11907
Tested-by: Jenkins
Reviewed-by: Stephen Champion <that.schamp@gmail.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>